Question: Which is the piano cycle with the lowest number of parts of a work of art, whose parts of the class is variation?
Paraphrase: What is the least amount of varied artwork pieces within a piano cycle?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q1746056 . ?ent wdt:P2635 ?obj . ?ent wdt:P2670 wd:Q214981. } ORDER BY ASC(?obj)LIMIT 5 
Answer: Six variations on a Swiss song for piano or harp, Theme et Variations, Nine Variations on "Lison dormait", K.264/315d, Theme and Variations, Eroica Variations